RCD or Residual Current Device is a generic term which covers both RCCB (Residual Current Circuit Breaker) and RCBO (Residual Current Circuit Breaker with Overload).

What Is RCD? RCD is a protective device in electrical system which automatically disconnect the supply system when imbalance detected in the value of phase and neutral current. British Standard BS 7671 defined RCD is as below: A mechanical switching device or association of devices intended to cause the opening of the contacts when the residual current attains a given value under specified conditions. The protective device RCD actually protect- direct and indirect contact, fire and thermal effect. For clear understand the difference between RCD and other broadly used Circuit Breaker, we should remember the definition of RCCB, RCBO, ELCB, GFCI etc. RCCB (Residual Current Circuit Breaker) is an electrical protective device that break or disconnects the circuit to become in safe mood whenever it detect an unbalance current flo…

Some times it become difficult to describe the known terms clearly to others. This article for the guy who works with HVAC, the terms related to HVAC system that everyday you use, keep in saved, may need at necessary. ABSOLUTE HUMIDITY - The weight of water vapor in a given amount of air. ABSOLUTE PRESSURE - Pressure measured with the base of zero. ABSOLUTE TEMPERATURE - A temperature scale expressed in degrees oF or oC using absolute zero as a base. Referred to as the Rankin or Kelvin scale. ABSOLUTE ZERO - The temperature at which molecular activity theoretically ceases. -456.69 F0 or -273.16 oC. AIR CONDITIONING - The process of controlling the temperature, humidity, cleanliness and distribution of the air. AIR, Standard Conditions - Conditions at which capacity ratings for air conditioning equipment is rated. AMBIENT - Refers to the temperature surrounding a body or unit under test. ATMOSPHERIC PRESSURE - The weight of a 1 unit column of the earth's atmosphere. BIMETAL - Two m…

What Is The Specialty For Bathroom Wiring Than Others?Yes, I am not meaning latest fashion about your bathroom. As a talk from an Electrical Engineer, I am talking about your bathroom safety fashion from the point of Electrical Engineering. You may be thinking, why different wiring need for bathroom, what is problem with same others wiring.

From the note of expert on wiring accessories like legrand we can quote as following that will give us basic idea about bathroom wiring exception.

“The wiring regulations are very strict. Every switch or other means of electrical control or adjustment shall be so situated as to be normally inaccessible in the bathroom. The required Ingress protection is managed through a series of defined zones progressively from the bath or shower. Pull cord switches are allowed, shaver sockets with isolating transformers are also allowed but should conform to BS EN 61558-2-5”. Especial Zone Rules In Bathroom SystemEspecial rules apply to bathroom wiring where the r…

Before unveil the secrecy to get high page rank for a blog, we would like to discuss the king rules of page rank for a blog or website. If we don’t know the scope or pre-condition of page rank for a website, may our works will to astray.

Some website contains huge potential to get good page rank, but not getting in just time due to lack of proper SEO (Search Engine Optimization). Oppositely any website can not get high page rank if does not contains quality contents. King Rules To Improve Page Rank For Blog Before go to the king rules to improving the page rank of your Blog, remember-

What Is Relay? How Do Relay Work?Relay a device that opens or closes a contact when energized. Relays are most commonly used in power systems, where their function is to detect defective lines or apparatus or other abnormal or dangerous occurrences and to initiate appropriate control action. When the voltage or current in a relay exceeds the specified “pickup” value, the relay contact changes its position and causes an action in the circuit breaker. A decision is made based on the information from the measuring instruments and relayed to the trip coil of the breaker, hence the name “relay.” Other relays are used as switches to turn on or off equipment.If you look at these two figure, you will find the very first basic idea, how relay make automatic a circuit just using the control circuit.Types of Relay Relay is nothing but an open or closed switch, but for the purpose and place of used relay may be different types or named. Relay may be used in HVAC, Appliances, Security, Pool & …

General Requirements And Importance Of Drawings-Diagrams For Underground Power Cable ProjectThe employer may engaged or contract with service-provider to execute an underground power cable project, service-provider actually carry out the whole works as per employer requirements. Here in this article we would like to focus on general requirements and importance of various drawings, designs and calculation sheet to execute an underground power cable project.

The term “drawing” should also included here diagrams, schedules, performance curves, and calculations etc. required for the comprehensive design of the works. The Service Provider should be responsible for the provision of all drawings required for the various stages of the Contract to execute the project. All drawings, apart from workshop drawings, should be submitted to the nominated Engineer for his approval, in accordance with an approved program. The Service Provider should ensure that drawings are submitted for approval in pri…

In a simple and shortly we can say surge arrester or lightning arrester is a device used in electrical power system to protect others equipment from switching surges or high energy lightning surges.

If you are hearing the terms “lightning arrester” or “surge arrester” very first time and thinking, it’s like something “police arrest terrorist”! Yes, you not quite wrong; lightning or surge like a destructive terrorist for electrical power system, surge arrester works like a police man, catch it and send to ground before destruct the system equipment.Don’t confuse lightning or surge arrester with lightning rod, surge suppressor or TVSS. Lightning Rod is a grounded potential device that divert the lightning surge;Suppressor is a lightning diverter device that uses in low voltage (below 1000V) system; TVSS is Transient Voltage Surge Suppressor used for divert the transient surge in low voltage (below 100v) system.

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What is Star Delta
Starter for Motor Starting? Star-Delta starter is an electrical
motor starting device, generally uses in big size motor to overcome some
technical limitation. Star and Delta means here 2 separate states of motor
running, first Star connection and then Delta connection. The starting current of any heavy
electric motor can be more than 4 times the normal load current it draws when
it has gained speed and has reached its normal running condition. To overcome
this initial high current enchanting problem, such arrangement needs Star
connection at starting time and if Star connection has sufficient torque to run
up to 75% to %80 of full load speed, then the motor can be connected in Delta
mode. When the motor connected to Delta
configuration the phase voltage increases by 173% and phase currents increase
by the same ratio. The line current increases three times its value in star
connection. What Problem
Starting Motor without Star-Delta?We already know, if the motor starts
si…

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3 Phase Electrical
Distribution Board DB Wiring Procedure To
understand and wiring an electrical distribution board, first of all you have
to clear understanding about DB or Distribution Board wiring definition and systems
as per international and local standard. Here you will find some basic idea
about Distribution Board and its types. What Distribution Board (DB) Is?A safe electrical
system designed for a house or premises that included isolation switches, protective
devices, connecting of multiple cable circuits including their associated neutral
and earth conductors. Distribution Boards are normally following three (3)
types- Main Distribution
Board (MDB):The
Distribution Board which in generally receive incoming source of Low Voltage
(LV) from transformer secondary of customer or the distribution company’s
service outlets. MDB is the first receiving point (bus bar) from Transformer or
Distribution Company. The MDB
may also be known as the ‘Consumer Unit’ where the main isolation de…

In a simple and shortly we can say surge arrester or lightning arrester is a device used in electrical power system to protect others equipment from switching surges or high energy lightning surges.

If you are hearing the terms “lightning arrester” or “surge arrester” very first time and thinking, it’s like something “police arrest terrorist”! Yes, you not quite wrong; lightning or surge like a destructive terrorist for electrical power system, surge arrester works like a police man, catch it and send to ground before destruct the system equipment.Don’t confuse lightning or surge arrester with lightning rod, surge suppressor or TVSS. Lightning Rod is a grounded potential device that divert the lightning surge;Suppressor is a lightning diverter device that uses in low voltage (below 1000V) system; TVSS is Transient Voltage Surge Suppressor used for divert the transient surge in low voltage (below 100v) system.

Electricity Myths Can be a KillerThere are lots of juicy myths on various subjects like earthquake, eclipse, etc. in almost every nations; but fact is that electricity myths are not jukes or fun, just a little mistake can cause of severe electrical shock, burn or even death!! If you don’t sure or without advice from electrician, do not believe any myth on electricity. To know the fact contact your nearest electricity utility company or any electrical professional or electrician. Our post on electricity myth and fact may not be juicy or folky but will give you some important information that will help to use safe electricity as well as save your electricity. Myths and Facts on Electrical SafetyMyth: Power lines are insulated, no chance to shock. Fact: Most of the powerlines are not insulated and insulated powerlines also can lost their insulation any time very easily. Myth:This line is safe because it is not high voltage line. Fact: Actually high voltage is n…

Procedure of Earth Electrode
Resistance Measurement by Digital Earth Tester: To ensure the system with
good earthed and not buried within the resistance area of others electrode. Earth
resistance requirements for all systems are not same, but everywhere it is
required to keep less to fulfil the system requirements. Now we are going to measure
the earth electrode or grounding rod resistance measurement by Earth Tester.
Previously, earth tester was totally horrible, manual or hand rotating DC
generator type, receiving accurate reading was difficult. Right now lots of
Digital Earth Testers are available in the market.
Measuring the Earth Electrode resistance we test actually to- Test the earth electrode
resistance;Ascertain the suitability of
the location of the electrode;Ensure that the electrode is
not buried within the resistance area of another electrode. Test Equipment Ranges:We are using simple digital
Earth Tester having Red-Yellow-Green 3 test cord; two test spikes, total Ohm range
…

Who will ensure the Industrial Labour Laws for Construction Labor at Site To ensure the industrial labour laws for employee of construction industry should follow the general laws as, the Service Provider must include for the provision of all necessary supervisory skilled and unskilled labour for erecting, testing and commissioning the works, together with all necessary transport, accommodation where required and other services to support his supervisory and labour force to meet the specified work completion. A staff tree of the Service Provider’s site organization for carrying out the agreed work should be set out in the schedules. The Service Providers forecast site staffing levels are to be submitted in a bar chart showing the duration of stay of each member. This bar chart will not form any limiting factor on the quantities of staff to be provided. How Labour Facilities Denoted in Employer- Contractor Agreement The Agreement Terms and Condition between Employer and Service Provider f…

History
of Wind Power Generation:In early, people learn to use wind as a power
sources, sailing boats or ships have been using wind power for at least 5,500
years. In 17th century BC, the Babylonian emperor Hammurabi used wind
power for irrigation work. Greek engineer Heron of Alexandria used wind to
drive wheel to power for a machine in 1st century AD, Ancient Tibet
and China also learned to use wind power since 4th century for speeding
grain crushing and water pumping.

Development
of Wind Power:From antiquity, middle-ages to modern 21th century;
using of wind power changed widely, modern technology shaping wind power to
generate electricity. In early 20th century, Denmark did remarkable
development in wind power to produce electricity, by 1908 there were 72 wind-driven
electric generator having capacity 5kW to 25kW. A gigantic change took place in 1978; multi
megawatt wind turbine was constructed for first time. Now for magic action of
modern technology many multinational companies…